WO2002003528A2 - Flux ring for an electric motor - Google Patents

Flux ring for an electric motor Download PDF

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Publication number
WO2002003528A2
WO2002003528A2 PCT/US2001/021343 US0121343W WO0203528A2 WO 2002003528 A2 WO2002003528 A2 WO 2002003528A2 US 0121343 W US0121343 W US 0121343W WO 0203528 A2 WO0203528 A2 WO 0203528A2
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic material
isotropic
ring
flux ring
motor
Prior art date
Application number
PCT/US2001/021343
Other languages
French (fr)
Other versions
WO2002003528A3 (en
Inventor
Hung T. Du
Original Assignee
Black & Decker Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Black & Decker Inc. filed Critical Black & Decker Inc.
Priority to US10/312,966 priority Critical patent/US6838797B2/en
Priority to JP2002507496A priority patent/JP2004503195A/en
Priority to EP01952453A priority patent/EP1297603A2/en
Priority to AU2001273204A priority patent/AU2001273204A1/en
Publication of WO2002003528A2 publication Critical patent/WO2002003528A2/en
Publication of WO2002003528A3 publication Critical patent/WO2002003528A3/en
Priority to US10/961,537 priority patent/US7181830B2/en

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/17—Stator cores with permanent magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K23/00—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors
    • H02K23/02—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors characterised by arrangement for exciting
    • H02K23/04—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors characterised by arrangement for exciting having permanent magnet excitation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49009—Dynamoelectric machine
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49009—Dynamoelectric machine
    • Y10T29/49011—Commutator or slip ring assembly
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49009—Dynamoelectric machine
    • Y10T29/49012—Rotor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49075—Electromagnet, transformer or inductor including permanent magnet or core
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49982—Coating
    • Y10T29/49986—Subsequent to metal working
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49988—Metal casting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/5313—Means to assemble electrical device
    • Y10T29/53143—Motor or generator
    • Y10T29/53161—Motor or generator including deforming means

Abstract

A flux ring for a motor of a power tool has an annular housing which fits inside the motor can of the motor. At least one magnet is on the ring. The at least one magnet includes a portion formed from an isotropic magnetic material and a portion formed from an anisotropic magnetic material. Preferably, the isotropic magnetic materials is sandwiched by the anisotropic magnetic material. The magnets being molded onto the flux ring in a two shot process.

Description

FLUX RING FOR AN ELECTRIC MOTOR
Background and Summary of the Invention
The present invention relates to AC and DC motors and, more particularly, to flux rings for the motors.
In order to improve motor performance, Rare Earth magnet such as Injection Bonded Neodymium-lron-Boron (N.I.B.) magnet is used. However, the rated operating temperature of the Injection Bonded N.I.B. magnet is typically in the range of 120°C. Thus, the power tool can be operated only up to this limited temperature. Also, the Injection Bonded N.I.B. magnet, particularly the isotropic N.I.B. magnet, is very hard to magnetize radially. The material costs increase dramatically when anisotropic material which enables radial magnetic field orientation is used.
The present invention provides the art with motor magnets which provide increased thermal performance. The magnets are also easier to magnetize such that the radial components of the magnets are directed to the center of the flux ring. Also, the magnets are cost-effective.
According to a first aspect of the invention, a flux ring for a motor comprises a ring which fits inside a motor can of the motor. At least one magnet is positioned on the ring. The at least one magnet includes a portion formed from an isotropic magnetic material and a portion formed from an anisotropic magnetic material. Generally, both magnets are formed from the isotropic and anisotropic materials.
The isotropic as well as anisotropic materials are magnetic powders. Also, the isotropic and anisotropic magnetic materials are in a resin which enables the material to be injection molded onto the ring. The isotropic magnetic material portion is sandwiched between two anisotropic magnetic material portions such that the isotropic magnetic material portion is on an arc circle of between 40° and 50°.
The magnet itself is on an arc circle of about 140° about the ring. The isotropic magnetic material portion is generally located on the poles of the motor. In accordance with a second aspect of the invention, a method of manufacturing a flux ring comprises providing a ring having an anchoring mechanism. Placing the ring in a die. Molding a first isotropic magnetic material onto the ring where the anchoring mechanism secures the first isotropic magnetic material to the ring. Molding a second anisotropic magnetic material onto the ring adjacent the first isotropic magnetic material. The anchoring mechanism secures the second anisotropic magnetic material to the ring. Further, the anisotropic magnetic material is molded on two sides of the first isotropic magnetic material. The first isotropic magnetic material is molded without a magnetic field present. The second anisotropic magnetic material is molded under a magnetic field of about 1400-1600 amp/meter. Also, the first isotropic magnetic material is molded along an arc circle of the ring along 40° to 50° of the circle. The second anisotropic magnetic material is molded along the circle such that the magnet covers about 140° of the circle. In accordance with a third aspect of the invention, a motor comprises a stator assembly with the stator assembly including a flux ring. The flux ring comprises an annular housing. At least one molded magnet is received on the housing. An anchor mechanism on the housing retains the at least one magnet on the annular housing. At least one magnet is positioned on the ring. The at least one magnet includes a portion formed from an isotropic magnetic material and a portion formed from an anisotropic magnetic material. Generally, both magnets are formed from the isotropic and anisotropic materials. The isotropic as well as anisotropic materials are magnetic powders. Also, the isotropic and anisotropic magnetic materials are in a resin which enables the material to be injection molded onto the ring. The isotropic magnetic material portion is sandwiched between two anisotropic magnetic material portions such that the isotropic magnetic material portion is on an arc circle of between 40° and 50°. The magnet itself is on an arc circle of about 140° about the ring. The isotropic magnetic material portion is generally located on the poles of the motor. Also, the motor comprises an armature rotatable within the stator assembly. A commutator is rotatable with the armature and connected to the armature via a shaft. A brush assembly is associated with the commutator.
In accordance with a fourth aspect of the invention, a power tool comprises a housing with a motor in the housing. The motor comprises a stator assembly with the stator assembly including a flux ring. The flux ring comprises an annular housing. At least one molded magnet is received on the housing. An anchor on the housing retains the at least one magnet on the annular housing. At least one magnet is positioned on the ring. The at least one magnet includes a portion formed from an isotropic magnetic material and a portion formed from an anisotropic magnetic material. Generally, both magnets are formed from the isotropic and anisotropic materials. The isotropic as well as anisotropic materials are magnetic powders. Also, the isotropic and anisotropic magnetic materials are in a resin which enables the material to be injection molded onto the ring. The isotropic magnetic material portion is sandwiched between two anisotropic magnetic material portions such that the isotropic magnetic material portion is on an arc circle of between 40° and 50°. The magnet itself is on an arc circle of about 140° about the ring. The isotropic magnetic material portion is generally located on the poles of the motor. Also, the motor comprises an armature rotatable within the stator assembly. A commutator is rotatable with the armature and connected to the armature via a shaft. A brush assembly is associated with the commutator. Also, the power tool includes an output member coupled with the motor shaft. An actuator member is electrically coupled between the motor and the power source to energize and de-energize the motor. In turn, when the motor is energized, the output member rotates. Additional objects and advantages of the present invention will become apparent from the detailed description of the preferred embodiment, and the appended claims and accompanying drawings, or may be learned by practice of the invention. Brief Description of the Drawings
Figure 1 illustrates a cross-section view of a power tool in accordance with the present invention.
Figure 2 illustrates a perspective view of a flux ring in accordance with the present invention.
Figure 3 is a cross-section view through Figure 2 along line 3-3 thereof.
Detailed Description of the Preferred Embodiment
Turning to Figure 1 , a power tool in accordance with the present invention is illustrated and designated with the reference numeral 10. The power tool 10 is illustrated as a drill; however, any type of power tool such as a screwdriver, sander, rotary tool, clippers, saw or the like which utilize an electric motor may be used with the motor of the present invention. The power tool 10 includes a housing 12 which surrounds a motor 14. An activation member 20 is coupled with the motor 14 as well as with a power source 22. The power source 22 may be a power cord (AC current) or the power tool may have a battery (DC current) as shown. The motor
14 is coupled with an output 16 which may include a transmission 17 and a chuck 18 to retain a tool (not shown) with the drill.
The motor 14 includes a stator assembly 30 which includes a housing 32, flux ring 34, and magnets 36 and 38. An armature 40 includes a shaft 42, a rotor 44 with laminations 46 and windings 48, as well as a commutator 50 coupled with the shaft 42. The motor also includes end plates 52 and 54. End plate 52 includes a bearing 56 which balances one end of the shaft 58 which is coupled with a pinion 60 which is part of the power tool output.
Brushes 62 and 64 which are associated with the commutator 50. A bearing 70 is also coupled with the end cap to balance rotation of the shaft 42.
Turning to Figure 2, the flux ring 34 is illustrated with magnets 36 and 38. The magnets 36 and 38 are of a molded magnetic material. Preferably, the molded material is an injection molded material. The ring 34 is positioned within a die and the magnetic material is molded onto the flux ring. Also, the housing 32 may be used as the flux ring. Thus, the discussion with respect to the ring 34 may equally apply to the metallic housing 32 of the motor 14.
The flux ring 34 includes anchors 80 to retain the magnets 36 and 38 onto the ring 34. The anchors 80 may be of two types. First, anchor 82 is an aperture formed in the housing 34. The aperture 82 has a first portion 84 and a second counter-sink portion 86. The counter-sink portion 86 extends to the exterior 88 of the ring 34. Thus, as seen in the cross-section in Figure 3, as the molded magnetic material is received in the aperture 82, the molded material has a neck 92 and a head 94. The head 94 and neck 92 provide an overall rivet appearance, thus the large head 94 acts to retain the magnet 36, 38 on the ring 34. The ring 34 may be comprised of just a plurality of aperture anchors 82 to retain the magnets on the ring 34.
Additional anchors 96 may be utilized on the ring. Anchors 96 project from the interior surface 98 of the ring 34. Ordinarily, the anchors 96 are stamped or the like into the ring 34 forming an aperture 100 immediately adjacent the projecting anchor 96. Thus, when the molded magnetic material forms around the projecting anchor 96, it likewise goes under the anchor 96 and fills in the aperture 100. This provides a firm securement for the magnet onto the ring 34. For a further understanding of the flux ring and anchors in accordance with the present invention, please see U.S. Patent Application Serial No. 09/492,059 filed January
27, 2000 entitled "Anchoring System for Injection Molded Magnets on a Flux Ring or Motor Housing", and U.S. Patent Application Serial No. 09/520,471 filed March 8, 2000 entitled "Permanent Magnet Motor Flux Rings", both of which the specification and drawings are herein incorporated by reference. Turning to the magnets 36 and 38, only one will be described since the description relates to both. The magnets 36 and 38 are divided into three portions 100, 102 and 104. The portion 100 is sandwiched between the portions 102 and 104. The magnet portion 100 is positioned on magnets 36 and 38 along the north and south poles. The magnetic portion 100 is along an arc circle of from about 40° to 50°. The magnetic portion 100 is formed from an isotropic magnetic powder compound. Also, the magnet includes a resinous material to bring the isotropic compound into an injectionable form. The isotropic magnetic powder compound has a high temperature rating and can be magnetized in situ. Thus, as the isotropic material is magnetized, since the material straddles the north and south pole of the magnetizing device, the isotropic material has its magnetic field substantially parallel to the poles pointing to the center of the flux ring.
The magnetic portions 102 and 104 are formed from an anisotropic magnetic powder compound with a desired resin so that they are likewise injection moldable. The anisotropic magnetic powder material is much easier to magnetize so that the magnet field of the anisotropic magnetic magnet portions 102 and 104 extend radially towards the center of the flux ring as seen by the arrows. The total arc of the arc circle of the magnet with the anisotropic magnetic portions sandwiching each side of the isotropic magnetic portion is approximately 140°.
A method of manufacturing a flux ring in accordance with the invention is accomplished by providing the annular housing. The annular housing within a die wherein the magnets may be injection molded onto the die. First, the isotropic magnetic portion is molded onto the flux ring and secured onto the flux ring by an anchor as described above. In the second step, the anisotropic magnet material is injection molded on both sides of the isotropic magnetic material sandwiching it in between the two anisotropic magnetic material portions. While the anisotropic magnetic material is being molded, a magnetic field is present such that the anisotropic magnet material is molded in a field of about 1400 amp/meter. No field is present during the molding of the isotropic magnetic material. After molding, a magnetizing mandrel is positioned inside of the flux ring to magnetize the entire can assembly. After this, the magnet is magnetized so that the fields of each magnet is pointing to the center of the flux ring. After the flux ring is produced, it is welded into a motor can and the above described elements are added to form a motor. Then the motor would be positioned into the housing of the power tool.
While the above detailed description describes the preferred embodiment of the present invention, the invention is susceptible to modification, variation, and alteration without deviating from the scope and fair meaning of the subjoined claims.

Claims

What is Claimed is:
1. A flux ring for a motor, comprising: a ring for fitting inside a motor can of a motor; at least one magnet on said ring, said at least one magnet including a portion formed from an isotropic magnetic material and a portion formed from an anisotropic magnetic material.
2. The flux ring according to Claim 1 , wherein isotropic magnetic material being an isotropic magnetic powder.
3. The flux ring according to Claim 1 , wherein said anisotropic magnetic material being an anisotropic magnetic powder.
4. The flux ring according to Claim 1 , wherein said isotropic magnetic material portion is sandwiched between two anisotropic magnetic material portions.
5. The flux ring according to Claim 4, wherein said isotropic magnetic material portion spans an arc circle of between 40° and 50° about said ring and said isotropic and two anisotropic magnetic material portions span about 140° about said ring.
6. The flux ring according to Claim 5, wherein said isotropic magnetic material is located on one of the poles of a motor.
7. The flux ring according to Claim 6, wherein one end is connected to said housing.
8. The flux ring according to Claim 1 , wherein said flux ring includes a pair of magnets.
9. A method of manufacturing a flux ring, comprising: providing a ring having an anchoring mechanism; placing said ring in a die; molding a first isotropic magnetic material onto said ring and said anchoring mechanism securing said first isotropic magnetic material onto said ring; molding a second anisotropic magnetic material onto said ring adjacent said first isotropic magnetic material and said anchoring mechanism securing said second anisotropic magnetic material to said ring.
10. The method according to Claim 9, further comprising molding said second anisotropic magnetic material on two sides of said first isotropic magnetic material.
11. The method according to Claim 9, further comprising molding said first isotropic magnetic material under no magnetic field.
12. The method according to Claim 9, further comprising molding said second anisotropic magnetic material under a magnetic field of about 1400-1600 amp/meter.
13. The method according to Claim 10, further comprising molding said first isotropic magnetic material along a portion of an arc circle of said ring, said portion being about 40° to 50 °.
14. The method according to Claim 13, further comprising molding said second anisotropic magnetic material along said arc circle such that said magnet covers about 140° of said circle.
15. A motor comprising: a stator assembly, said stator assembly including a flux ring comprising: at least one magnet on said ring, said at least one magnet including a portion formed from an isotropic magnetic material and a portion formed from an anisotropic magnetic material; an armature rotatable within said stator assembly; a commutator rotatable with said armature and connected to said armature via a shaft; and brush assemblies associated with said commutator.
16. The flux ring according to Claim 15, wherein isotropic magnetic material being an isotropic magnetic powder.
17. The flux ring according to Claim 15, wherein said anisotropic magnetic material being an anisotropic magnetic powder.
18. The flux ring according to Claim 15, wherein said isotropic magnetic material portion is sandwiched between two anisotropic magnetic material portions.
19. The flux ring according to Claim 18, wherein said isotropic magnetic material portion spans an arc circle of between 40° and 50° about said ring and said isotropic and two anisotropic magnetic material portions span about 140° about said ring.
20. The flux ring according to Claim 19, wherein said isotropic magnetic material is located on one of the poles of a motor.
21. The flux ring according to Claim 20, wherein one end is connected to said housing.
22. The flux ring according to Claim 15, wherein said flux ring includes a pair of magnets.
23. A power tool comprising: a housing; a motor in said housing, said motor comprising: a stator assembly, said stator assembly including a flux ring comprising: at least one magnet on said ring, said at least one magnet including a portion formed from an isotropic magnetic material and a portion formed from an anisotropic magnetic material; an armature rotatable within said stator assembly; a commutator rotatable with said armature and connected to said armature via a shaft; brush assemblies associated with said commutator; a power supply; an output member coupled with said motor shaft; and an actuator member electrically coupled between said motor and said power source for energizing and de-energizing said motor which, in turn, rotates said output member when said motor is energized.
24. The flux ring according to Claim 23, wherein isotropic magnetic material being an isotropic magnetic powder.
25. The flux ring according to Claim 23, wherein said anisotropic magnetic material being an anisotropic magnetic powder.
26. The flux ring according to Claim 23, wherein said isotropic magnetic material portion is sandwiched between two anisotropic magnetic material portions.
27. The flux ring according to Claim 26, wherein said isotropic magnetic material portion spans an arc circle of between 40° and 50° about said ring and said isotropic and two anisotropic magnetic material portions span about 1 0° about said ring.
28. The flux ring according to Claim 27, wherein said isotropic magnetic material is located on one of the poles of a motor.
29. The flux ring according to Claim 28, wherein one end is connected to said housing.
30. The flux ring according to Claim 23, wherein said flux ring includes a pair of magnets.
PCT/US2001/021343 2000-07-05 2001-07-05 Flux ring for an electric motor WO2002003528A2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US10/312,966 US6838797B2 (en) 2000-07-05 2001-07-05 Flux ring for an electric motor
JP2002507496A JP2004503195A (en) 2000-07-05 2001-07-05 Flux ring for electric motor
EP01952453A EP1297603A2 (en) 2000-07-05 2001-07-05 Flux ring for an electric motor
AU2001273204A AU2001273204A1 (en) 2000-07-05 2001-07-05 Flux ring for an electric motor
US10/961,537 US7181830B2 (en) 2000-07-05 2004-10-08 Process of manufacturing a flux ring for an electric motor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/609,855 2000-07-05
US09/609,855 US6462448B1 (en) 2000-07-05 2000-07-05 Flux ring for an electric motor

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US09/609,855 Continuation US6462448B1 (en) 2000-07-05 2000-07-05 Flux ring for an electric motor

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US10312966 A-371-Of-International 2001-07-05
US10/961,537 Division US7181830B2 (en) 2000-07-05 2004-10-08 Process of manufacturing a flux ring for an electric motor

Publications (2)

Publication Number Publication Date
WO2002003528A2 true WO2002003528A2 (en) 2002-01-10
WO2002003528A3 WO2002003528A3 (en) 2002-08-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2001/021343 WO2002003528A2 (en) 2000-07-05 2001-07-05 Flux ring for an electric motor

Country Status (6)

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US (4) US6462448B1 (en)
EP (1) EP1297603A2 (en)
JP (1) JP2004503195A (en)
CN (1) CN1618159A (en)
AU (1) AU2001273204A1 (en)
WO (1) WO2002003528A2 (en)

Families Citing this family (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001069692A (en) * 1999-08-27 2001-03-16 Matsushita Electric Ind Co Ltd Permanent magnet filed type, small-sized direct-current motor
US6462448B1 (en) * 2000-07-05 2002-10-08 Black & Decker Inc. Flux ring for an electric motor
US6694730B2 (en) * 2002-05-30 2004-02-24 Superconductor Technologies, Inc. Stirling cycle cryocooler with improved magnet ring assembly and gas bearings
EP3292821A1 (en) 2002-05-31 2018-03-14 Vidacare LLC Apparatus and method to access bone marrow
US11337728B2 (en) 2002-05-31 2022-05-24 Teleflex Life Sciences Limited Powered drivers, intraosseous devices and methods to access bone marrow
US8641715B2 (en) 2002-05-31 2014-02-04 Vidacare Corporation Manual intraosseous device
US8668698B2 (en) 2002-05-31 2014-03-11 Vidacare Corporation Assembly for coupling powered driver with intraosseous device
US10973545B2 (en) 2002-05-31 2021-04-13 Teleflex Life Sciences Limited Powered drivers, intraosseous devices and methods to access bone marrow
TWI298892B (en) * 2002-08-29 2008-07-11 Shinetsu Chemical Co Radial anisotropic ring magnet and method of manufacturing the ring magnet
US20060181168A1 (en) * 2003-04-14 2006-08-17 Hargraves Donald E Pump motor with bearing preload
US9504477B2 (en) 2003-05-30 2016-11-29 Vidacare LLC Powered driver
US20050056036A1 (en) * 2003-09-17 2005-03-17 Superconductor Technologies, Inc. Integrated cryogenic receiver front-end
US6822441B1 (en) * 2004-04-28 2004-11-23 Delphi Technologies, Inc. Half turn vehicle sensor having segmented magnet
EP1816725A1 (en) * 2006-02-03 2007-08-08 University of Teheran Permanent magnet assembly for electric machines and actuators, method for their design and electric machines and actuators
US8944069B2 (en) 2006-09-12 2015-02-03 Vidacare Corporation Assemblies for coupling intraosseous (IO) devices to powered drivers
US7653981B2 (en) * 2006-09-28 2010-02-02 Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg Method of providing a housing for a permanent magnet electric motor
WO2008048492A2 (en) * 2006-10-13 2008-04-24 Black & Decker Inc. Motor with permanent magnets and method of manufacturing; power tool with same
US7673380B2 (en) * 2007-04-23 2010-03-09 Varco I/P, Inc. Methods for making rotors for permanent magnet motors
JP2009065027A (en) * 2007-09-07 2009-03-26 Daido Electronics Co Ltd Integrated yoke type magnetic body
JP4671997B2 (en) * 2007-10-23 2011-04-20 三菱電機株式会社 Rotor for rotating electrical machine and method for manufacturing the same
US7919893B2 (en) * 2008-05-14 2011-04-05 Sunonwealth Electric Machine Industry Co., Ltd. Permanent magnet rotor with annular rib coupling
US8310123B2 (en) * 2008-07-28 2012-11-13 Direct Drive Systems, Inc. Wrapped rotor sleeve for an electric machine
KR101074559B1 (en) * 2010-04-15 2011-10-17 주식회사비.엠.씨 Motor for vehicle seat
CN102457135B (en) * 2010-10-20 2016-08-10 德昌电机(深圳)有限公司 Starting motor used by engine
DE102010063323A1 (en) * 2010-12-17 2012-06-21 Robert Bosch Gmbh A method of manufacturing a machine component for an electric machine and a machine component
DE102011085985A1 (en) * 2011-11-09 2013-05-16 Robert Bosch Gmbh Electric motor assembly
MX2015014978A (en) * 2013-09-05 2016-06-24 Skykar Inc Synchronous electric machines.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4110718A (en) * 1975-06-20 1978-08-29 Robert Bosch Gmbh Magnetic structure, particularly permanent magnet for motor fields, and method
US4417167A (en) * 1977-09-14 1983-11-22 Sony Corporation DC Brushless motor
WO1993022778A1 (en) * 1992-04-28 1993-11-11 Sumitomo Special Metals Company Limited Cylinder type anisotropic magnets and their manufacturing methods and motors
EP1093133A2 (en) * 1999-10-15 2001-04-18 Matsushita Electric Industrial Co., Ltd. Rare earth resin magnet, magnet rotor, magnet motor using the same, and its manufacturing method

Family Cites Families (61)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE321007C (en) 1919-01-15 1920-05-21 Robert Bosch Akt Ges Ignition device with cylindrical magnet
US3422295A (en) 1966-09-01 1969-01-14 Gen Electric Permanent magnet stator with split casing and method of making
US3519858A (en) * 1967-03-13 1970-07-07 Stanley Works Portable electrical tool having permanent magnet field
DE1613011A1 (en) 1967-06-03 1970-10-08 Krupp Gmbh Stator of a permanently magnetically excited small motor
DE2155752A1 (en) 1971-11-10 1973-05-17 Bosch Gmbh Robert METHOD OF MANUFACTURING A POLE HOUSING FOR ELECTRIC MACHINERY
JPS5911253B2 (en) 1975-05-22 1984-03-14 ソニー株式会社 motor
DE2535210A1 (en) 1975-08-07 1977-02-24 Bosch Gmbh Robert Magnet frame for small electric motor - is made from single punched out metal plate with interlocking joint
GB1580574A (en) 1976-06-21 1980-12-03 Kumakura S Annular magnet assembly
DE2810215C3 (en) 1978-03-09 1993-12-02 Bosch Gmbh Robert Method for applying an additional inference to the housing of an electrical machine
DE2837254A1 (en) 1978-08-25 1980-03-06 Hilti Ag HAND DRILLING MACHINE WITH ELECTRIC DRIVE MOTOR
DE2845264A1 (en) * 1978-10-18 1980-05-08 Bosch Gmbh Robert ELECTRICAL MACHINE, ESPECIALLY SMALL MOTOR
US4327346A (en) 1979-02-28 1982-04-27 Tdk Electronics Co., Ltd. Anisotropic polymeric magnet in the tubular form and process for producing the same
US4335323A (en) 1980-01-17 1982-06-15 Ambac Industries, Incorporated Stamped sheet metal frame for dynamoelectric machine
DE3036941A1 (en) 1980-09-30 1982-04-08 Siemens AG, 1000 Berlin und 8000 München Small electric motor esp. for automobile air cooler - has permanent magnets fixed on inner face of motor housing, attached by slotted, flexible clamp
JPS5895182U (en) 1981-12-22 1983-06-28 三菱電機株式会社 dc motor
US4438362A (en) * 1982-08-19 1984-03-20 Rotron, Incorporated Self-starting, direct current motor with permanent magnets of varied magnetic strength
US4547758A (en) 1982-12-02 1985-10-15 Hitachi Metals, Ltd. Cylindrical permanent magnet and method of manufacturing
US4594525A (en) 1983-06-27 1986-06-10 General Electric Company Rotatable assembly for a dynamoelectric machine
JPS60131055A (en) 1983-12-16 1985-07-12 Hitachi Ltd Stator of magnet type dc machine and manufacture thereof
FR2562734B1 (en) 1984-04-05 1988-05-06 Ducellier & Cie STATOR FOR SMALL ELECTRIC MOTORS
DE3426126A1 (en) 1984-07-16 1986-01-23 Braun Ag, 6000 Frankfurt STATOR FOR DC CURRENT MOTORS
JPS6162349A (en) * 1984-08-31 1986-03-31 Hitachi Ltd Field structure of permanent magnet dc machine
FR2573933B1 (en) 1984-11-28 1987-02-13 Marchal Equip Auto IMPROVEMENTS IN METHODS FOR MANUFACTURING AN ELECTRIC MACHINE HEAD, AND AN ELECTRIC MACHINE HEAD
US4625392A (en) 1985-09-05 1986-12-02 General Electric Company Method of manufacturing a molded rotatable assembly for dynamoelectric machines
JPH0757082B2 (en) * 1985-09-18 1995-06-14 株式会社日立製作所 Permanent magnet field type motor
US4801834A (en) 1986-04-30 1989-01-31 General Electric Company Rotor assembly
US4683393A (en) 1986-05-23 1987-07-28 General Electric Company Reinforced rotor assembly and method of making same
US4757603A (en) 1986-05-23 1988-07-19 General Electric Company Method of making a reinforced rotor assembly
FR2617344B1 (en) 1987-06-23 1993-05-21 Valeo ELECTRIC ROTATING MACHINE STATOR WITH PERMANENT MAGNETS
US4795932A (en) 1987-07-31 1989-01-03 United Technologies Electro Systems, Inc. Double insulated motor including a magnet retainer
DE3736519A1 (en) * 1987-10-28 1989-05-11 Standard Elektrik Lorenz Ag DC GENERATOR WITH PERMANENT MAGNETIC STAND
US4881988A (en) 1987-11-16 1989-11-21 Rjf International Corporation Novel flexible magnet for use in small dc motors
US4850100A (en) 1987-12-23 1989-07-25 General Electric Company Method of making a rotor assembly
US4873461A (en) 1988-05-13 1989-10-10 Stryker Corporation Electric motor sterilizable surgical power tool
JPH0286418A (en) 1988-09-22 1990-03-27 Shin Kobe Electric Mach Co Ltd Molding method and molding die equipment for plastic magnet
US4973872A (en) 1988-10-07 1990-11-27 Emerson Electric Co. Dynamoelectric machine rotor assembly with improved magnet retention stucture
US4910861A (en) 1988-10-07 1990-03-27 Emerson Electric Co. Method of manufacturing retention structure for electric motor rotor magnets
US5167271A (en) * 1988-10-20 1992-12-01 Lange Frederick F Method to produce ceramic reinforced or ceramic-metal matrix composite articles
CA2014974A1 (en) * 1989-03-18 1991-10-19 Ken Ikuma Dies for extrusion moulding
JPH02254707A (en) * 1989-03-28 1990-10-15 Seiko Epson Corp Manufacture of permanent magnet
DE3923974A1 (en) 1989-07-20 1991-01-31 Swf Auto Electric Gmbh METHOD FOR PRODUCING AN ELECTRIC MOTOR
US5206556A (en) 1989-08-29 1993-04-27 Mabuchi Motor Co., Ltd. Field magnet for miniature motors
US5121021A (en) 1989-12-06 1992-06-09 General Motors Corporation Frame and magnet assembly for a dynamoelectric machine
US5204569A (en) * 1990-02-07 1993-04-20 Asmo Co., Ltd. Anisotropic magnet for rotary electric machine
US5203071A (en) 1990-11-05 1993-04-20 Ryobi Motor Products Corp. Method of motor construction
US5160867A (en) 1990-11-05 1992-11-03 Ryobi Motor Products Corp. Motor field assembly
JPH04248340A (en) 1991-01-24 1992-09-03 Matsushita Electric Ind Co Ltd Magnet motor
JPH04347548A (en) 1991-05-24 1992-12-02 Mitsuba Electric Mfg Co Ltd Casing structure of motor
US5268607A (en) 1992-09-09 1993-12-07 Webster Plastics Molded resin motor housing
GB9321785D0 (en) 1993-10-22 1993-12-15 Johnson Electric Sa Permanent magnet rotor
DE4401847A1 (en) 1994-01-22 1995-07-27 Teves Gmbh Alfred Cage for holding permanent magnets in a stator of an electrical machine
US6080352A (en) * 1994-07-11 2000-06-27 Seagate Technologies, Inc. Method of magnetizing a ring-shaped magnet
US5796200A (en) * 1994-08-22 1998-08-18 Kabushiki Kaisha Sankyo Seiki Seisakusho Brushless motor having an anisotropic driving magnet and an isotropic frequency magnet
DE69402707T2 (en) 1994-10-05 1997-09-11 Denso Corp Electric rotating machine and method of manufacturing the same
FR2730874B1 (en) 1995-02-16 1997-03-21 Ugimag Sa COMPOSITE INDUCTOR FOR ROTATING ELECTRIC MACHINES COMPRISING SINTERED PERMANENT MAGNETS COATED IN A FERROMAGNETIC BINDER
DE19524953A1 (en) 1995-07-08 1997-01-09 Teves Gmbh Alfred Electric motor esp. for driving pump of vehicle braking system - has stator with axial extension for fastening electric motor to unit housing
JP3327079B2 (en) * 1995-11-29 2002-09-24 松下電器産業株式会社 Electric bicycle
US5895026A (en) 1996-03-06 1999-04-20 Kelsey-Hayes Company Foil wound coil for a solenoid valve
US5969448A (en) * 1997-07-03 1999-10-19 Data Storage Institute Electric spindle motor
JP3674270B2 (en) * 1997-04-23 2005-07-20 松下電工株式会社 Electric tool
US6462448B1 (en) * 2000-07-05 2002-10-08 Black & Decker Inc. Flux ring for an electric motor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4110718A (en) * 1975-06-20 1978-08-29 Robert Bosch Gmbh Magnetic structure, particularly permanent magnet for motor fields, and method
US4417167A (en) * 1977-09-14 1983-11-22 Sony Corporation DC Brushless motor
WO1993022778A1 (en) * 1992-04-28 1993-11-11 Sumitomo Special Metals Company Limited Cylinder type anisotropic magnets and their manufacturing methods and motors
EP1093133A2 (en) * 1999-10-15 2001-04-18 Matsushita Electric Industrial Co., Ltd. Rare earth resin magnet, magnet rotor, magnet motor using the same, and its manufacturing method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 228 (E-426), 8 August 1986 (1986-08-08) -& JP 61 062349 A (HITACHI LTD) *

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US6838797B2 (en) 2005-01-04
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